I AM a tall Ed cosplayer (5'10") and I crack myself up. At Katsu I'll be wearing a sign on my back that says "I drank my milk", and I'll have a 5'2" Mustang with me, so it'll be opposite world from one of Ed's fantasies or something.
Besides height I look a lot like him, I use my own hair and bangs and everything.
Just as we shouldn't judge people's cosplays based on their weight or gender or race, height shouldn't matter either, since it's a thing we can't change about ourselves. This said, I do appreciate the comedy that I am cosplaying a character a foot shorter than me xD